I'm sorry your daughter's ill and has had to pull out of the challenge and it's also a shame that the finances have tumbled into a mess.
However, you need to separate these issues in your mind and put all your emotions about your daughter to one side and look at the money solely as a financial issue.
Write a list of which individual gave how much money, irrespective of whether it was a gift or an investment or a loan.
Total up that list, it should total £3,000
That should also be a true list from all the relatives' points of view.
They have given money for something that did not take place and they want their money back.
You received £2,700 back from the company because they kept 10% as the deal didn't happen.
So, initially, contact everyone on your list who paid and refund each one of them 90% of what they paid, explaining that the company has kept the 10%.
When you've saved up, refund each one of them the last 10% as a gesture of goodwill.
I understand you're saying the £2,700 went into an overdrawn account and you've not said how much of that £2,700 was refunded by you to only some relatives. BUT that is not the relatives' problem.
From their perspective, you have received the refund of £2,700, you were given that money and you have not paid them all back.
It doesn't matter what you think about people asking you for a refund instead of going to the Police etc. Shelve those thoughts as well, they only obfuscate the situation.
Peel this issue back to the bare bones.
- The relatives gave money expecting certain conditions to be fulfilled.
- Those conditions were not fulfilled.
- You were refunded "their money" less 10%
- You have not refunded all of the people who gave money.
- You need to refund all the people the exact amount that they gave, because if you do not, they think you have stolen their money.